def main():
    import sys
    input = sys.stdin.readline

    N = int(input())
    adj = [[] for _ in range(N)]
    for _ in range(N-1):
        u, v = map(int, input().split())
        adj[u].append(v)
        adj[v].append(u)
    cnt_0 = 0
    cnt_1 = 0
    for i in range(N):
        if len(adj[i]) == 0:
            cnt_0 += 1
        elif len(adj[i]) == 1:
            cnt_1 += 1
    if cnt_0 >= 2:
        print('Alice')
    elif cnt_0 == 1 and cnt_1 >= 1:
        print('Alice')
    else:
        print('Bob')


if __name__ == '__main__':
    main()